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Patent Searching and Data


Title:
OPTICAL SYSTEM, IMAGING DEVICE COMPRISING SAME, AND IMAGING SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/235373
Kind Code:
A1
Abstract:
An optical system 10 comprising a front group 11, a light-blocking member 4, and a rear group 12, arranged in order from the object side to the image side. An opening that is long in a first direction is provided in the light-blocking member 4. The front group 11 has a non-spherical surface 3. No image of the object is formed on the opening in a first cross-section parallel to the first direction but an intermediate image of the object is formed on the opening in a second cross-section perpendicular to the first direction. The rear group 12 has a diffractive surface 5 that splits luminous flux that has passed through the opening, in the second cross-section, into a plurality of luminous fluxes having mutually different wavelengths and the plurality of luminous fluxes condense at different positions in the second cross-section. The radius of curvature for the non-spherical surface 3 in the second cross-section is different between an on-axis position and a most off-axis position in the first direction.

Inventors:
KUDO GENICHIRO (JP)
KANO HIROTO (JP)
KIMURA KAZUMI (JP)
YOSHIDA HIROKI (JP)
Application Number:
PCT/JP2019/021657
Publication Date:
December 12, 2019
Filing Date:
May 31, 2019
Export Citation:
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Assignee:
CANON KK (JP)
International Classes:
G02B17/00; G01N21/47; G01N21/88; G02B3/02; G02B5/18; G02B13/08; G02B27/42; H04N5/225
Foreign References:
US20060082772A12006-04-20
US20180066987A12018-03-08
US6046808A2000-04-04
US7199877B22007-04-03
JP2018109863A2018-07-12
JP2019044280A2019-03-22
Other References:
See also references of EP 3812821A4
Attorney, Agent or Firm:
ABE Takuma et al. (JP)
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